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Hey iceman,
just fyi not sure if you know this or not. your depth of field increases with the wider your focal length. at 17mm even at moderate apertures you will still have quite a substantial amount of depth of field.
A lot of guys make the mistake that you need to stop a lens down all the way to maximise your depth of field. Whilst I'm over simplifying a bit, and can explain a bit better in person - At 17mm you have so much DoF that you'll find something like f/8 or f/11 would be plenty.
The problems with running f/22 are ;
- diffraction
- A lens is typically at it's sharpest 2 stops from wide open and at it's worst wide open or fully stopped down.
The only times to run f/22 are ;
1) macro photography (but you are dealing with much longer focal lengths and much closer working distances)
2) If you have a subject very close to the lens, so you want to focus on it and keep your background in focus as well.
Even the lenses I use are pretty crud fully stopped down.
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